A furious Trump, who in the last month has escalated his attacks on Robert Mueller's Russia investigation, said from the White House that it was a "disgrace" that the FBI "broke into" his lawyer's office. He called Mueller's investigation "an attack on our country," prompting new speculation that he might seek the removal of the Justice Department's special counsel.

The raid was done by the U.S. Attorney's office in Manhattan and was based in part on a referral from Mueller, said Cohen's lawyer, Stephen Ryan.

"The decision by the U.S. Attorney's Office in New York to conduct their investigation using search warrants is completely inappropriate and unnecessary," Ryan said in a statement. "It resulted in the unnecessary seizure of protected attorney client communications between a lawyer and his clients."

The raid creates a new legal headache for Trump as he and his attorneys weigh whether to agree to an interview with Mueller's team, which in addition to investigating potential ties between Russia and the Trump campaign is also examining whether the president's actions constitute obstruction of justice.

The law enforcement action will almost certainly amplify the public scrutiny on the payment to Daniels, who says she had sex with Trump in 2006. The payment was made just days before the 2016 presidential election, and Trump told reporters last week that he did not know about it.

To obtain a warrant, prosecutors and agents must convince a judge they have probable cause of criminal activity and that they believe they'll find evidence of wrongdoing in a search. A warrant requires multiple levels of approval within the Justice Department, and agency guidelines impose additional hurdles when the target of a search is an attorney.

Authorities working with Mueller chose a similar tactic last summer when they raided the Virginia home of former Trump campaign chairman Paul Manafort, who was subsequently indicted.

In this case, though, Mueller opted to refer the matter to federal prosecutors in Manhattan. Besides Cohen's office, agents also searched a hotel room where he's been staying while his home is under renovation.

Under Justice Department regulations, Mueller must consult with Deputy Attorney General Rod Rosenstein when his investigators uncover new evidence that may fall outside his original mandate. Rosenstein then will determine whether to allow Mueller to proceed or to assign the matter to another U.S. attorney or another part of the Justice Department.

A spokesman for Mueller's office did not immediately return a call seeking comment. White House spokeswoman Sarah Huckabee Sanders and the U.S. attorney's office also had no comment. The New York Times first reported Monday's raid.

Ryan did not elaborate on the documents that were taken from Cohen's office but said he has cooperated with investigators, including meeting last summer with lawmakers looking into Russian interference in the 2016 presidential election.

Cohen has more recently attracted attention for his acknowledgment that he paid Daniels $130,000 out of his own pocket just days before the 2016 presidential election. Cohen has said neither the Trump Organization nor the Trump campaign was a party to the transaction with Daniels and he was not reimbursed for the payment.

Several former officials at the Federal Election Commission have said the payment appears to be a violation of campaign finance laws, and multiple Washington-based groups have filed complaints with the FEC, urging it to investigate.

There have been few signs that Mueller was interested in investigating the payment, though. One Mueller witness, former Trump aide Sam Nunberg, recently connected the special counsel with the payment, saying in an interview on MSNBC last month that prosecutors had asked him about it.

Trump answered questions about Daniels for the first time last week, saying he had no knowledge of the payment made by Cohen and he didn't know where Cohen had gotten the money. The White House has consistently said Trump denies the affair.

Daniels has said she had sex with the president in 2006. She has been suing to invalidate the nondisclosure agreement she signed before the election and has offered to return the $130,000 she was paid in order to "set the record straight."

Daniels argues the agreement is legally invalid because it was signed by only Daniels and Cohen, and was not signed by Trump.

Last month, Daniels' attorney, Michael Avenatti, sent letters to the Trump Organization demanding the business preserve all of its records relating to the $130,000 transaction.

The letter demanded they preserve all emails by Cohen that mention Daniels, whose real name is Stephanie Clifford, as well as any emails and text messages related to the alleged relationship. He sent similar demand letters to two banks — City National and First Republic — asking they preserve documents connected to the transaction.

Avenatti also enclosed an email showing Cohen had used his Trump Organization email address in correspondence with a representative from First Republic. In the email, the representative said funds had been deposited in Cohen's account.

Federal agents searched Cohen's office at 30 Rockefeller Plaza in New York, where he had been working as part of a "strategic partnership" with the law firm Squire Patton Boggs.

On Monday, the firm said in a statement that its relationship with Cohen had "reached its conclusion, mutually and in accordance with the terms of the agreement."

"We have been in contact with Federal authorities regarding their execution of a warrant relating to Mr. Cohen," the firm said. "These activities do not relate to the firm and we are in full cooperation."

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